In today's world, where data is king, storing and retrieving data has become crucial. A popular method of storing data is using a database management system (DBMS), and one of the most popular DBMSs is SQL. SQL (Structured Query Language) is a programming language to manage data stored in relational databases. SQL procedures are a powerful way to execute complex logic in the database and can be used to retrieve, manipulate and process data.JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy to read and write. It has become a popular way to exchange data between web applications and APIs. SQL Server 2016 introduced built-in support for JSON data in SQL Server, which has made it possible to store, retrieve and process JSON data in the database.Passing JSON data as a parameter to SQL procedures has become a common requirement in today's applications. This article will explore how to pass JSON data as a parameter to an SQL procedure.The first step is to create an SQL procedure that accepts a JSON parameter. The syntax for creating an SQL procedure that accepts a JSON parameter is as follows,

CREATE PROCEDURE [schema].[procedure_name]
@json_data NVARCHAR(MAX)
AS
BEGIN
-- SQL Procedure Logic
END

The parameter @json_data is of the NVARCHAR(MAX) type, which is used to store large Unicode character strings. This parameter will be used to pass JSON data to the SQL procedure.Once the SQL procedure is created, we can pass the JSON data as a parameter to the procedure using the EXECUTE command. The syntax for passing JSON data as a parameter to an SQL procedure is as follows,

DECLARE @json_data NVARCHAR(MAX)SET @json_data = '{"name": "John", "age": 30, "city": "New York"}'EXECUTE [schema].[procedure_name] @json_data

In the above example, we have declared a variable @json_data and assigned a JSON object to it. We have then passed this JSON object as a parameter to the SQL procedure using the EXECUTE command.We can use the OPENJSON function inside the SQL procedure to parse the JSON data passed as a parameter. The OPENJSON function converts the JSON data into a table, which we can then use to manipulate the data. The syntax for using the OPENJSON function inside an SQL procedure is as follows,

CREATE PROCEDURE [schema].[procedure_name]
@json_data NVARCHAR(MAX)
AS
BEGIN
DECLARE @name VARCHAR(50)
DECLARE @age INT
DECLARE @city VARCHAR(50)

SELECT @name = value FROM OPENJSON(@json_data) WHERE [key] = 'name'
SELECT @age = value FROM OPENJSON(@json_data) WHERE [key] = 'age'
SELECT @city = value FROM OPENJSON(@json_data) WHERE [key] = 'city'

-- SQL Procedure Logic using @name, @age and @city variables
END

In the above example, we have declared three variables, @name, @age, and @city, which will be used to store the data from the JSON object. We then used the OPENJSON function to extract the values from the JSON object and assigned them to the corresponding variables. We can then use these variables in our SQL procedure logic.

In conclusion, passing JSON data as a parameter to SQL procedures is a powerful technique that can be used to store, retrieve and process JSON data in the database. With the built-in support for JSON data in SQL Server, it has become much easier to work with JSON data in the database.

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